JP3636069B2 - Rotating machine armature - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an armature of a rotating electrical machine.
[0002]
[Prior art]
As a prior art, there is an armature 100 shown in FIG. In this armature 100, a reinforcing ring 130 is attached to the outer periphery of a coil end portion (a portion where the armature coil 110 protrudes in the axial direction from the end face of the armature core 120) which is the weakest portion against centrifugal force. The centrifugal end reinforcement of the coil end part is made.
[0003]
[Problems to be solved by the invention]
The reinforcing ring 130 is attached to the outside of the slot insulating paper 140 in the axial direction so as not to overlap the slot insulating paper 140 protruding in the axial direction from the end face of the armature core 120. Therefore, the coil end portion needs to secure a straight portion necessary for mounting the reinforcing ring 130 on the outside of the slot insulating paper 140, which is a factor in increasing the axial length of the armature 100.
[0004]
However, in recent years, it has become necessary to shorten the coil end portion that does not contribute to performance in response to the demand for downsizing the rotating electrical machine. Nevertheless, the reduction in size of the rotating electrical machine inevitably leads to an increase in the rotational speed of the armature 100, so that the reinforcing ring 130 is becoming an essential part. As a result, the mounting method of the reinforcing ring 130 has become a problem as the rotating electrical machine is required to be downsized.
The present invention has been made on the basis of the above circumstances, and an object thereof is to provide a mounting method of a reinforcing ring that can cope with downsizing of a rotating electrical machine.
[0005]
[Means for Solving the Problems]
(Means of Claim 1)
In the armature of the present invention, a part of the insulating paper protruding in the axial direction from the end face of the armature core is cut off to expose the outer peripheral surface of the coil end portion, and a reinforcing band is provided on the exposed outer peripheral surface of the coil end portion. Wearing.
According to this configuration, the mounting position of the reinforcing band is brought closer to the armature core side as compared with the conventional armature in which the reinforcing band is mounted on the outer side of the insulating paper protruding in the axial direction from the end face of the armature core. Therefore, the straight portion of the coil end portion can be shortened as compared with the prior art, which can contribute to shortening the armature shaft length.
[0006]
(Means of Claim 2)
In the armature of the rotating electric machine according to claim 1,
A resin material is interposed in a gap generated between the coil end portion and the reinforcing band.
In this case, since the gap generated between the coil end portion and the reinforcing band can be filled with the resin material, it is not necessary to strictly manage the inner diameter accuracy of the reinforcing band.
[0007]
(Means of claim 3)
In the armature of the rotating electric machine according to claim 1,
By pressing the reinforcing band into the outer peripheral surface of the coil end part, a gap between the coil end part and the reinforcing band can be eliminated, and the anti-centrifugal strength of the armature coil can be improved.
[0008]
(Means of claim 4)
A rotating electric machine having the armature according to any one of claims 1 to 3,
A commutator connected to the armature coil and provided in the armature, and a brush that slides on the commutator by rotation of the armature.
In a rotating electric machine having a commutator, the abrasion powder (brush powder) of the brush is scattered as the armature rotates, and if the brush powder enters between the armature coil and the armature core, the insulation is hindered. . On the other hand, the armature of the present invention, as described in claim 1, only cuts a part of the insulating paper and exposes the outer peripheral surface of the coil end portion. The inner peripheral side of the end portion is covered with insulating paper protruding in the axial direction from the end face of the armature core, and the insulating property does not deteriorate.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a half sectional view of an armature.
The armature 1 of this embodiment is an armature of a starter motor used for, for example, an automobile starter. As shown in FIG. 1, the rotary shaft 2, the armature core 3, the armature coil 4, the commutator 5, etc. It is made up of.
[0010]
The armature core 3 is configured by laminating a plurality of steel plates provided in the same shape by press molding, and is press-fitted and fixed to the rotary shaft 2. The armature core 3 is provided with a plurality of slots 3a for accommodating the armature coils 4 in the circumferential direction.
On both sides of the armature core 3 in the axial direction, insulating plates 6 are assembled in contact with the core end surfaces.
[0011]
The armature coil 4 is housed in the slot 3a via a slot insulating paper 7 (which will be described in detail below), and has a coil end portion that protrudes outside the slot 3a on both sides in the axial direction of the armature core 3. ing. A reinforcing ring 8 is mounted on the outer periphery of the coil end portion in order to improve the centrifugal strength of the armature coil 4.
The commutator 5 is configured by assembling a plurality of commutator pieces 5a into the cylindrical shape at the end of the rotating shaft 2, and the end of the armature coil 4 is electrically connected to the riser 5b provided in each commutator piece 5a. And mechanically connected. A brush 9 is disposed on the outer peripheral surface of the commutator 5.
[0012]
The slot insulating paper 7 insulates between the armature core 3 and the armature coil 4 and is provided longer than the length obtained by adding the thickness of the two insulating plates 6 to the entire length of the armature core 3. As shown in FIG. 1, both ends in the axial direction are inserted into the slot 3a in such a state that they protrude outward from the insulating plate 6 by appropriate lengths a1 and b1, respectively. However, a part corresponding to the outer peripheral side of the coil end part is cut off, and the lengths a2 and b2 projecting outside the insulating plate 6 are set shorter than the inner peripheral side (a1 and b1). (See FIG. 2).
For example, as shown in FIG. 3 (development view), the slot insulating paper 7 is formed by cutting off both end corners in the width direction (vertical direction in FIG. 3) into (a) an arc shape or (b) a straight line shape. . The shape in which the corners of both ends of the slot insulating paper 7 are cut off is arbitrary.
[0013]
As shown in FIG. 1, the reinforcing ring 8 is mounted so as to be hooked on the outer peripheral surface of the coil end portion exposed by cutting a part of the slot insulating paper 7. The coil end portion has a straight line portion (a portion where the outer diameter of the coil end portion is substantially constant at a predetermined length in the axial direction) necessary for mounting the reinforcing ring 8.
The reinforcing ring 8 is made of, for example, a resin and is an annular body having a certain width, and is attached to the outer peripheral surface of the coil end portion in a press-fit state.
[0014]
(Effects of the first embodiment)
In the armature 1 of this embodiment, a part of the slot insulating paper 7 is cut out to expose the outer peripheral surface of the coil end portion, and the reinforcing ring 8 is attached to the outer periphery of the exposed coil end portion. Compared with the armature, the mounting position of the reinforcing ring 8 can be brought closer to the armature core 3 side. Therefore, the straight portion of the coil end portion can be made shorter than the conventional one by cutting the slot insulating paper 7, and the axial length of the armature 1 can be shortened. Thereby, even if the axial length of the armature 1 is shortened, the anti-centrifugal strength of the armature coil 4 can be ensured, and the armature 1 that can cope with high rotation can be provided.
[0015]
Further, the slot insulating paper 7 does not have to be cut out at all the portions protruding from the end face of the insulating plate 6, but may be cut out so that at least the outer peripheral surface of the coil end portion can be exposed. In other words, since it is not necessary to cut off a portion corresponding to the inner peripheral side of the coil end portion, the insulation is not impaired on the inner peripheral side of the coil end portion to which the abrasion powder of the brush 9 is likely to adhere.
[0016]
(Second embodiment)
FIG. 4 is a cross-sectional view of the coil end portion to which the reinforcing ring 8 is attached.
In this embodiment, as shown in FIG. 4, a resin material 10 is interposed between the coil end portion and the reinforcing ring 8. The resin material 10 is, for example, an epoxy resin (thermosetting resin), and fills a gap generated between the coil end portion and the reinforcing ring 8.
In this case, since it is not necessary to strictly manage the inner diameter accuracy of the reinforcing ring 8, in addition to the effects of the first embodiment, there is a merit that the reinforcing ring 8 can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a half sectional view of an armature (first embodiment).
FIG. 2 is a perspective view showing a shape of slot insulating paper protruding from a core end.
FIG. 3 is a development view of slot insulating paper.
FIG. 4 is a sectional view of a coil end portion to which a reinforcing ring is attached (second embodiment).
FIG. 5 is a half sectional view of an armature (prior art).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Armature 3 Armature core 3a Slot 4 Armature coil 5 Commutator 7 Slot insulation paper 8 Reinforcement ring (reinforcement belt)
9 Brush 10 Resin material

Claims (4)

An armature core having a plurality of slots;
An armature coil housed in the slot via insulating paper;
In the armature of a rotating electric machine comprising an annular reinforcing band attached to the outer periphery of the coil end portion of this armature coil,
A portion of the insulating paper protruding in the axial direction from the end face of the armature core is cut out to expose the outer peripheral surface of the coil end portion, and the reinforcing band is attached to the exposed outer peripheral surface of the coil end portion. An armature of a rotating electric machine characterized by In the armature of the rotating electric machine according to claim 1,
An armature for a rotating electrical machine, wherein a resin material is interposed in a gap generated between the coil end portion and the reinforcing band. In the armature of the rotating electric machine according to claim 1,
The armature for a rotating electrical machine, wherein the reinforcing band is press-fitted into an outer peripheral surface of the coil end portion. A rotating electric machine having the armature according to any one of claims 1 to 3,
A commutator connected to the armature coil and provided in the armature;
A rotating electrical machine comprising: a brush that slides on the commutator by rotation of the armature.

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